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Filter Envelope
Sequential
Filter Envelope
The Trigon-6’s lowpass lter is modulated by a dedicated four-stage
envelope generator. The Filter Envelope is used to shape the harmonic
characteristics of a synthesized sound over time by giving you ltering
control over its attack, decay, sustain, and release stages.
This is one of the most important factors in designing a sound. Without
an envelope, the lters would be completely static. They would stay open
or closed by a xed amount that wouldn’t change over the duration of a
sound. That’s not very interesting to listen to and it’s not how instruments
behave in the real world.
In general, sounds produced by an instrument are brighter at their begin-
ning (the attack stage) and grow mellower as they die out (the decay and
release stages). In other words, their harmonic content changes over time.
This is exactly what the lter envelope is designed to emulate.
Filter envelope
attack
decay
sustain
release
amplitude
time
note offnote on
A typical 4-stage envelope
Attack: Sets the attack time of the envelope. The higher the setting, the
slower the attack time and the the longer it takes for the lter to open
from the level set with the lter cutoff knob to the level set by the lter
envelope amount. Percussive sounds typically have sharp (short) attacks.
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